0.43 Thz Emission From High-T C Superconducting Emitters Optimized At 77 K

Keywords

heat removal; high temperature superconductor; intrinsic Josephson junctions; liquid nitrogen immersion; terahertz emission

Abstract

A liquid helium-free, compact and continuous sub-terahertz radiation system operating at 77 K has been developed using a rectangular mesa device made from a high T c -superconducting Bi 2 Sr 2? CaCu 2 O 8+δ single crystal, based on a different design of a stand-alone mesa sandwich structure to reduce the dc-current Joule heating effects. The mesa was thermally connected to sapphire plates through thin thermal grease embedded with diamond nano-crystals. When immersed in liquid N 2 , the device emits intense radiation at 0.437 THz, the highest frequency ever achieved at 77 K, due to excitation of the TM(1, 0) rectangular cavity mode. By varying the dc currentvoltage bias and the bath temperature in a He-flow cryostat, the devices emission frequency is broadly tunable from 0.31 THz at 79 K to 1.31 THz at 30 K.

Publication Date

1-20-2016

Publication Title

Journal of Physics Condensed Matter

Volume

28

Issue

2

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1088/0953-8984/28/2/025701

Socpus ID

84950253918 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84950253918

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